在 Django 中，如何使用 Request 检索下拉列表中选定的值并将其拆分为两个单独的值？

Question

目前我恢复了第三个下拉列表（Extract_single_city）的选定值，如下所示：

city = request.GET.get("extract_single_city")

仍然使用

request

，我想检索（例如）马德里和巴塞罗那的值，创建两个变量：

departure

和

destination

。例如，

departure

将是马德里，

destination

将是巴塞罗那。

正如您从照片中的下拉列表中看到的，我可以在第二个下拉列表（

Trip

）或第三个下拉列表（

extract_single_city

）中恢复两个值：这是同一件事，但我认为更容易从第二个下拉列表中恢复值。不同之处在于，在第二个下拉列表中，值由连字符 (-) 连接，因此必须将它们分开，而在第三个下拉列表中，值以已经分开且单独的方式填充，但可能更难以恢复他们从这里来。

我正在使用这个解决方案与

global

，但我不喜欢它，我想使用一些与

request

global departure, destination
departure = trip.city_departure.name,
destination = trip.city_destination.name

或者我正在使用这个（但它不起作用）

departure = request.GET.get("trips").split("-")[0] #or split("-", 0)
destination = request.GET.get("trips").split("-")[1] #or split("-", 1)

views.py

def trip_selector(request):
    if "Hx-Request" in request.headers:
        trips = FullRecord.objects.none()

        if request.headers["Hx-Trigger"] == "id_trip":
            country_id = request.GET.get("country")

            if country_id != "":
                trips = FullRecord.objects.filter(country_id=country_id)
            return render(request, "trips.html", {"trips": trips})
        
        elif request.headers["Hx-Trigger"] == "id_extract_single_city":
            selected_trip = request.GET.get("trips")
            extracted_cities = []

            if selected_trip != "":
                trip = FullRecord.objects.get(id=int(selected_trip))
                trip_with_combined_names = trip.departure_destination
                split_trip = trip_with_combined_names.split("-")
                extracted_cities = split_trip
                
            return render(request, "extract_single_city.html", {"options": extracted_cities})
        
    else:
        countries = Country.objects.all()
        return render(request, "form.html", {"countries": countries})

forms.html

{% extends 'base.html' %} 

{% block main-content %}
    <div class="flex justify-between px-10 gap-5 mt-5">
        <div class="flex flex-col w-full">
            <!-- First Combobox -->
            <label for="id_country">Country</label>

            <select name="country" id="id_country">
                <option value="">Please select</option>
                {% for country in countries %}
                    <option value="{{ country.pk }}">{{ country.name }}</option>
                {% endfor %}
            </select>
        </div>

        
        <div class="flex flex-col w-full">
            <!-- Second Combobox ??????? (non lo so)-->
            <label for="id_trip">Trip</label>
            <select name="trips" id="id_trip"
                    hx-get="{% url 'trips' %}"
                    hx-include="[name=country]"
                    hx-indicator=".htmx-indicator"
                    hx-trigger="change from:#id_country">
            </select>
        </div>

        <!-- Third Combobox -->
        <div class="flex flex-col w-full">
            <label for="id_extract_single_city">Extract single city</label>
            <select name="extract_single_city" id="id_extract_single_city"
                    hx-get="{% url 'trips' %}"
                    hx-include="[name=trips]"
                    hx-indicator=".htmx-indicator"
                    hx-trigger="change from:#id_trip">

            </select>
        </div>
    </div>

    <div class="flex flex-col w-1/2 justify-end">
        <button class="bg-green-300  p-2 rounded"
                type="button"
                hx-get="{% url 'result' %}"
                hx-include="#id_extract_single_city"
                hx-target="#id_result"> Submit
                <!-- hx-swap="beforeend">Submit -->
        </button>
    </div>
    
    <div class="py-2 px-10 h-96 mt-5">
        <textarea name="result" id="id_result" readonly class="w-full h-full rounded px-2 py-3"></textarea>
    </div>
 



{% endblock main-content %}

trips.html

<option value="">Please select</option>
{% for trip in trips %}
    <option value="{{ trip.id }}">{{ trip.city_departure }}-{{ trip.city_destination }}</option>
{% endfor %}

extract_single_city.html

<option value="">Please select</option>
{% for i in options %}
    <option value="{{ i }}">{{ i }}</option>
{% endfor %}

模型.py

from django.db import models

class Country(models.Model):
    name = models.CharField(max_length=40)

    def __str__(self):
        return self.name


class City(models.Model):
    country = models.ForeignKey(Country, on_delete=models.CASCADE)
    name = models.CharField(max_length=40)

    def __str__(self):
        return self.name


class FullRecord(models.Model):
    country = models.ForeignKey(Country, on_delete=models.CASCADE)
    city_departure = models.ForeignKey(City, on_delete=models.CASCADE, related_name="city_departure")
    city_destination = models.ForeignKey(City, on_delete=models.CASCADE, related_name="city_destination")

    @property
    def departure_destination(self):
        return f"{self.city_departure}-{self.city_destination}"

    def __str__(self):
        return self.country.name

谢谢！！！

Answer 1

split功能不起作用的原因是你从HTML带来的数据是“值”。当您使用

request.GET.get("trips")

时，它不会让您

{{ trip.city_departure }}-{{ trip.city_destination }}

。带上这个：

{{ trip.id }}

，因为这是你的“价值”。